I agree with you, Gulazon. It helps one identify their quadra.
I'm writing, you know, about that nebulous area between two types--in this case, beta NFs or STs, what some call creative subtypes--model a or x or whatever you're using. .. It exists in all of the models. (see example.)
I'm wondering if there's any new insight on this forum about it.... How to make that nebulous area more clear-cut.